
function tsCheck(arr: Number[]) {
    return arr.length
}


/* describe data */
interface Account {
    id: number
    displayName: string
    version: 1
}

function welcome(account: Account) {
    console.log("id" + account.id, `name:${account.displayName}`, `ver:${account.version}`)
}

function tsErrorCatch() {

}



console.log(tsCheck([1,2,3]))